transport value of field to another form

[gprzytula]

small progress
when the called form is not open : the value is correctly transferred and new form is being opened - but on top of my dialogs and I have to close it to return to caller form
if the called form is already open from menu, the focus is given to that form - but value is not transferred and I can navigate between forms/tabs
is there an option on open form to open it as a regular tab as in second screenshot . I specified the assignment of field in on load/on open but still with previous open no data transfer

[Welshgasman]

If the form is already open (not sure that was ever mentioned ) then I doubt the OpenArgs is going to work? The clue is in the name?
So if the form is already open, then you just set the control value with normal form naming convention Forms!FormName!ControlName ?

May as well just open the form and they set as above. That way it should work if the form is open or not?
You would needt to test that though.

[gprzytula]

finally resolved the problem

specified in on open : transfer of data and open form (that is closed)
specified in on activate : transfer of data on form already open

If Not OpenArgs = "" Then
[Forms]![Bewegingen_open]![Boekref_open] = OpenArgs
End If

specified acwindownormal for acwindowmode opens the form as a regular tab and navigation between tabs is possible

ref = [Forms]![Beweging_Uit]![Boek_ref]
DoCmd.OpenForm "Bewegingen_open", , , , , acWindowNormal, ref

Many thanks to all for all help/hints
best regards, Guy

[Micron]

Maybe use TempVars if you want to read or set a value regardless of whether or not the form is open? If using tabbed views that will have to be the default, so remove whatever popup and/or modal properties you have set. If you want to open it some other way at times then set the window data mode or form popup/modal property in the opening code. AFAIK, those will override the tab view.

[Welshgasman]

That syntax is for setting an external form control?
As I mentioned before, if that is the form, use Me., and then it is much clearer to anyone viewing the code